Diphthongs take the breathing, as the accent ( cross152), over the second vowel: αἱρέω hairéo I seize, αἴρω aíro I lift. But ᾳ, ῃ, ῳ take both the breathing and the accent on the first vowel, even when ι is written in the line (5): ᾄδω ἌιδωI sing, ᾅδης Ἅ_ιδηςHades, but Αἰνεία_ςAeneas. The writing ἀίδηλος (Ἀίδηλος) destroying shows that αι does not here form a diphthong; and hence is sometimes written αϊ (8).